Speaking of potential blockbusters, Guardians of the Galaxy star Chris Pratt dropped by The Late Show, where David Letterman uncharacteristically gushed over his guest. At one point, the host had to stop himself from continuing to talk about how great he thought Guardians was.

And here's something that probably won't ever happen again: Daniel Radcliffe cut the hair of a complete stranger. Fallon may have celebrity beer pong tournaments, but Jimmy Kimmelsometimes manages to have even stranger ideas.